Throttle valve application



March l1, 1952 J. w. MARSH THROTTLE VALVE APPLICATION Filed Oct. 19,1945 5 Sheets-Sheet l J. W. MARSH THROTTLE VALVE APPLICATION March ll,1952 5 Sheets-Sheet 2 WWW/ Filed Oct. 19, 1945 March l1, 1952 J. w.MARSH THROTTLE VALVE APPLICATION 5 Sheets-Sheet 3 Filed Oct. 19, 1945FIG.

J. w. MARSH THROTTLE VALVE APPLICATION March l, 1952 5 Sheets-Sheet 4Filed Oct. 19, 1945 gmc/rm March l1, 1952 J. w. MARSH THROTTLE vALvEAPPLICATION 5 Sheets-Sheet 5 Filed Oct. 19, 1945 Patented Mar. 1l, 1952UNITED STATSPATENT OFFICE.

THROTTLE VALVE APPLICATION John W. Marsh, Alexandria, Va.

Application October 19, 1945, Serial No. 623,260 4 Cairns. (o1. 121-443)This invention relates to improvements in throttle valve application andmore particularly to the control of fluid pressure operated devices suchas the steam cylinders of -a locomotive or locomotives.

It is among the objects of this invention to provide for controlling athrottle valve operated by iiuid pressure tight means operativelycontrolled from a remote point. A further object of this invention is toprovide for controlling iluid pressure supplied to ailuid pressureutilizing means without employing mechanical means interposed betweenthe control point and the pressure utilizing means, and without anexternal operating cylinder and stung box.

Another object of this invention is to provide for a multiple unitcontrol, of a plurality of fluid pressure operated devices, such assteam locomotives coupled together.

A further object of this invention is to combine ,with the conduitsystem between a source of fluid pressure and a fluid pressure operatedmeans, a fluid pressure control valve operatively controlled from aremote point.

These and other objects and. advantages of this invention will becomeapparent upon consideration of the following detailed description whentaken in conjunction with the accompanying drawings, in which likecharacters designate like parts, and in which Figure 1 is a. partialsectional view of a uid pressure actuated throttle valve which lis morecompletely described and claimed in my co-pending application, Serial No. 564,374, now forfeited.

' Figure 2 is a partial sectional view of a hand l control device,suitable for operatively controlling the throttle valve shown in Figure1 froma remote point.

Figure 3 is a diagrammatic view illustrating motive cylinder.

Figure 4 is a sectional view of a locomotive cylinder with the remotelycontrolled throttle valve of the present invention mounted thereon.

the application of the throttle valve on a loco- -f- Figure 5 is adiagrammatic view illustrating an Referring at first more particularlyto Figure 3 of the drawings which illustrates an application of thepresent invention, it will be explained that 3 designates a source offluid pressure such as the boiler of a locomotive. At 8 there has beenillustrated conventionally a superheater to which is connected asuperheater header 'l provided with a drypipe 6 leading to a main stopvalve I3. These parts are all conventional and do not constitute a partof the present invention. The reference character A designates thethrottle valve oi the present invention which has its inlet connected toa steam pipe 9 leading from the super heater header 'I or from anyportion of the source of fluid under pressure. The throttle has anoutlet 26 which is connected to any common or preferred form of steamchest 24 associated with an engine cylinder 20 as is the commonpractice. The valve member of the throttle A is subject at one sidethereof to the fluid pressure conducted thereto by the pipe 9 from thesource of pressure and'is thereby held closed. Provision is made foropening the valve of the throttle by means of fluid pressure applied tosaid valve in opposition to the operating pressure admitted to thethrottle, as by means of a conduit I 4 leading from a hand-actuatedthrottle control device B which is in communication with a suitablesource of fluid pressure, such as the boiler 3 of the locomotive, bymeans of the pipe I6. A vent pipe I'l is provided for the device B. Fromthe foregoing it will be understood that the throttle is held closed bythe fluidpressure entering the throttle from the source of pressure, andthat the throttle may be opened by manipulation of the throttle controldevice B which is utilized for the purpose of controlling pressurethrough pipe I4 to the throttle in opposition to the operating pressuresupplied thereto through the pipe9. By selectively actuating the deviceB, uid pressure from the pipe 9 to the throttle A may be controlled atwill for throttling the supply of pressure through the pipe 9 to thesteam chest 24, and for completely shutting oi the supply thereto.

Referring to Figure 1, it will be seen that there is provided a housingI, having an inlet 2 and an outlet 4, each of which communicates withchamber II in housing I. Chamber II is closed by cover I2, provided witha control conduit I4. Inlet 2 and outlet 4 are separated by web 5 onwhich is seated main valve I0. Auxiliary valve I 8 is seated on mainvalve Ill and is provided with stem I9, secured to piston 22, slideablymounted in cylinder II. Main valve III is provided with vanes I5 whichguide valve I0 through web 5 and extend toward piston 22. The structurethus described constitutes the pressure actuated throttle valve of thepresent invention.

Fluid pressure in inlet chamber 2 holds valves I0, I8 on theirrespective seats until suicient fluid pressure is applied throughconduit I4 on piston 22 working in chamber Il as a piston cylinder toovercome the uid pressure on the exposed surfaces of valves I0, I8,whereupon the smaller auxiliary valve I8 opens, permitting piston 22 tomove into contact with vanes I5 and open main valve I0. The fluidpressure established in outlet 4 acts on piston 22 -to oppose fluidpressure operatively applied, on piston4 22 through conduit i4. Theopening and closing of valves I0, I8 is effected by the difference influid pressure acting on the opposite sides of piston 22, whereby anyfluidV pressure may be maintained in outlet 4 by operatively maintain,-ing a corresponding fluid pressure on piston 22 through conduit I4, allas more fully illustrated and described in my co-pending applicationSerial N o. 564,374.

A hand actuated throttle control device for applying and maintainingfluid pressure on. piston` 22, through conduit I4 is shown in Figure 2v,in which 39 isa housing having piston 28 slideably disposed therein.lThe upper end of housing 39 is threaded and engages member 46, which maybe rotated by stem 4I and handle 45. Spring 21. is interposed betweenthreaded member l40, and piston 28. Piston ,28 has a central opening 29closedv by valve 31. Housing 39v is provided with cover 34, having inlet35 communidating with a ysource of fluid pressure through conduit Is.Housing sa is also proviaeawith anputlet 4.6, communicatingv throughconduit I4 with the throttle valve` heretofore described, and.with'exhaust port41, communicating with opening 29,` and exhausting totheatmosphere through conduit n. valve. 31 is also provided with asecond seat 38 which controls. communication between inlet 36 and outlet46..

'Rotation' of threaded member 40 compresses spring'21 against piston28,c1osingI valve 31 and opening seat 38 to'admit fluid under pressuretooutlet 46, and conduit I4. When iluidv pressure in out1et'46 actingundery piston 28, is sufficient to raise'. piston 28. againstl thevcompression,y of spring 2,1, seat 38. closes.. Any reduction of fluidpressure in.4 conduit I4 reduces fluid pressureu'nder piston 2-8 whichvunderthe influence ofspring, 21, moves downward-to open seat 38 and`reestablish the desired. uid pressure in con- 14.'V pressure. in conduitI4 in excessfof that desired andI cont-rolled.; bypositioning ithreaded*member 40, acts alsol under piston 28 to raise piston 28 against thepressure ofA spring` 2-1 and withdrawy piston 2.8 from vali/e131,4 thusdischarging fluid` fromv conduitL I4 throughfopening 29 to exhaust port4] andV exhaust conduit I1. The construction andoperation L thiscontrol` valve isrmore completely described in myA cti-peri dir igapplication, Serial No. 564,374, and is related to thelvalvedescribedand Claimed: in my oo-oondne. opplioatiooseriaLNo- 596,637, filed May30, 1945 now` Patent No. 2,450,480, dated October 5, 1948.

A typical applicationof this invention is-shown in Figure 3, in which 3designatesa locomotive boiler, provided with drypipe Ii, superheaterheader. 1, superheater 8, and branch pipes 9. The throttle structure A,shown in Figure l. is `mount.- edoneach steam chest 24, communicatingwith the. steam spaceY of the boiler through a branch pipe, superheaterheader, superheaterl andz dry.-

pipe aforesaid. A main stop valve I3, which forms no part of the presentinvention, may be provided and operated from the cab of the locomotive,so that maintenance or repair operations may be performed withoutblowing 01T boiler pressure. The throttle structure A also communicates,through conduit I4, with a hand actuated throttle control device B, suchas shown in Figure 2, mounted in the locomotive cab in a positionconvenient for manual operation. Conduit I6 provides communicationbetween the inlet of control device B and the steam space of the boiler.Conduit I1 exhausts steam from the control valve-B to a point outsidethe cab.

A- more detailed view of the application of the throttle valve to thesteam chest of a locomotive Acylinder is shown in Figure 4, in which 20is a locomotive cylinder having a piston 2l slideably disposed thereinand secured to piston rod 23,l by which connectionis made toconventional driving mechanism. A steam chest 24 is attachedV tocylinder 20` and has a valving member 2 5 slideably disposed therein forestablishing communication between inlet 26y and'I alternate ends ofcylinder 20 through ports-30,031. The throttle structure A, generally asshown in Figure his mounted onsteam, chest 24'., In'this particularapplication, inletl 2 is provided with a flanged opening. 69. adapted'to be.y scoured. to branchpipe 9 (Fig. 3), leading from superheaterheader of locomotiveand; with cover 10,4 secured to housing. ..foraccess to. valve. w. 4s applied to asteam locomotive, a throttle valveofV the, type dssoribod may be applied to the. steam ohestff eachcylinder, andr'both throttle valves simultanoouslr4 Controlled. from.the. locomotive cab. by the. throttle. Control. device B of; the.present in..- vention `without the intervention of any mechanicaldevices. Conduit I4 may provide com,- muncatiorl between. a throttlecontrol device B and: e plurality of. throttle structures A, and thusall: Such throttle Structures may be. Simultaneously controlled by thersingle device B.V

Another typicalgvappiication of thisl invention is shown in Figure 5',in which, 3 designateskalocomotive boiler,y providedjwithadrypipe 6,superhea-tor. header. 32, superheater 8. and, branch piges.. 33..Communicating with. Cylinder. Steam chests, 2,4.' The throttle`structur e,` which mayV be a singlevalve as shown in Figurel., oramultiplgvalve assnownmiguto 6I. may. b mounted on the superheaterheader 32 and controlledby pressure.. admitted., to the. throttle.through, goof duitV M .;undcr control, by;` thethrottle control deviceB,which may be. as'shownin Figure zand mounted, in thelocomotivecab asaforesaid.,

InI 'the application'of. the. throttle structure shown in Figure l tosuperheater headeru, housing. i is. attached tofheeder 32, inlet 21oommuoioofins with header-outlet. 35.. and closed-.by cover 42 attachedto housing l. outietcigbifurcate'd, and secured to--branch pipes 33communicatingwith,.cvylinder-steam chests 24.

The applicationoff a multiple throttle valve structure. toj the fsuperbo-@too header; is; Shown.. in @teilig-Figure 65 'in which:throttle inletfchamber 49 communicates with,I superheaterr headeroutloff -3.5.aosi-.oloood by oovors 1l., 12, 13. Secured@ to; housneffsI Housing-5.2 ispro-videdfwith outlet chamber 53 having hanged`outlets-50,-5I adapted-to be securedfrespectively tolbranch pipes 33j(Fig. 5);-'to-admit pressure tothe steam chest 24,-, Inlet; chamber 491;separatedffrom outlet chamber A5 3gby` web 54 -on which areV seated:valves I0, 56, 59. Communicating with outlet chamber 53 are cylinders60, 6I, 63, having pistons 22, 66, 61, respectively, slideably disposedtherein. Cylinders 68, 6I, 63are provided with closure 62, andcommunicate with a throttle control device B such, as shown in Figure 2,through conduit I4. Auxiliary valve I8 is seated on valve I and isprovided with stem I9, secured to piston 22. Valve I8 is provided withvanes I5 which extend toward piston 22. Valves 56, 59 are provided withvanes 58, 64 respectively, which extend to pistons 66, 61, and valves56, 59 arefsecured respectively to pistons 66, 61 by bolts 65,51.

Fluid pressure in inlet chamber 49 holds valves I0, I8, 56, 59 on theirrespective seats until suflioient fluid pressure is applied throughconduit I4 and under pistons 22, 66, 61 ,to overcome the fluid pressureon the exposed surfaces of valves I0, I8, 56, 59. Since the ratiobetween the area of piston 22 and valve' I8 is substantially greaterthan the ratios between the areas of the other pistons and theirrespective valves, valve I 8 opens first, permitting piston 22 to moveinto contact with varies I5 and open valve I8. The area of piston 66 issmaller relative to the area of valve 56 than is the area of piston 22relative to the area of valve I0, hence a controlled fluid pressureapplied under piston 22 will overcome source fluid pressure on valve Illand open valve I8 fully before the same controlled fluid pressureapplied under piston 66 will overcome the source fluid pressure actingon valve 56 and open valve 56. Similarly the area of piston 61 issmaller relative to the area of valve 59 than is the area of piston 66relative to the area of valve 56, and a controlled fluid pressureapplied under piston 66 will overcome source fluid pressure acting onvalve 56 and open valve 56 fully before the same controlled uid pressureapplied under piston 61 will overcome source fluid pressure acting onvalve 59 and open valve 59. Valves I8, 56 and 59 open successively toprogressively admit pressure from inlet header 49 into outlet chamber53. The fluid pressure in outlet chamber 53 acts also on top of pistons22, 66, 61 to oppose fluid pressure controllably applied under pistons22, 66, 61, through conduit I4. The opening and closing of valves I0,I8, 56, 59 is effected by the difference in fluid pressure acting onopposite sides of pistons 22, 66, 61, whereby any fluid pressure may bemaintained in outlet chamber 53 .by maintaining a controlledcorresponding fluid pressure below pistons 22, 66, 61 through conduitI4, by means of throttle control device B all as more fully described inmy co-pending application Serial No. 564,374.

With reference to Figure '7, 43 indicates a ilrst locomotive and 44indicates a second locomotive coupled thereto, each locomotive beingprovided with throttle valves A, of the type shown and described herein,and in my co-pending application, Serial No. 564,374, and at least onelocomotive provided with a throttle control device B, which may be ofthe type shown in Figure 2 and described herein. Conduit I4 extends overthe length of each locomotive and is provided with flexible couplings 48between the locomotives, and with cocks 55 to close the ends of theconduit I4 when the locomotives are uncoupled. Cutoff cock 68 isprovided in control conduit I4, adjacent to throttle control device B,which may be closed to prevent loss of control fluid at a non-operativethrottle device B, as on a second locomotive 44, when control iseffected from the first locomotive 43. It will be apparent that fluidpressure maintained in conduit I4 by deviceB will control the fluidpressure in the steam chests of all locomotives simultaneously, and thatall locomotives .will be operatively controlled thereby as a unit.

The opening of cutoff cock 68 on any following locomotive as 44 willpermit control fluid preslsure in conduit I4 to be exhausted and shutoffthe .supply of steam to all steam chests. Also the failure by leakage inconduit I4, or in flexible couplings 48, will shut off supply of steamto all steam chests.

It will be further apparent that this invention provides means tooperatively maintain desired fluid pressure at a plurality of fluidpressure utilizing means simultaneously from a remote point, suchcontrol being effected without mechanical means, such as throttlelevers, rods, bell cranks and stuffing boxes, and while particularlyapplicable to steam locomotive or locomotives, is not restricted to suchuse, but is equally applicable to the control of fluid pressure wheresuch control is desired at a single, or plurality of utilizing means.

It will be still further apparent that the arrangements shown may bemodified to place the throttle at any point between the source and theutilizing means, or to combine the throttle with any element in thefluid conduit system, such as boiler drypipe or point of bifurcation.

The structures and arrangements shown and described are all typical of aprinciple of fluid pressure control embodied in this invention, andother structures, arrangements and lapplications within the spirit ofthis invention will suggest themselves to one skilled in the art. Theembodiments shown and the embodiments claimed are, therefore, tobeconsidered in all respects as illustrative and not restrictive, andall changes that come within the means and range or equivalency of theembodiments shown and the embodiments claimed are, therefore, intendedto be embraced therein.

Having described my invention, what I claim as new and wish to secure byLetters Patent is:

1. In combination, an operating cylinder adapted to produce power byapplication of fluid pressure, a distributing valve chamber mounted onsaid cylinder and containing means to distribute fluid under pressure toalternate ends of said cylinder, a throttle valve mounted on saiddistributing valve chamber, a source of fluid under pressurecommunicating with said throttle valve and holding said valve closed,said throttle valve being actuated by fluid tight means wherein fluidpressure in said distributing valve chamber opposes fluid pressurecontrolled from a remote point.

2. In combination with a steam locomotive cylinder, a steam chestthereon adapted to enclose means to distribute steam to alternate endsof said cylinder, and ports adapted to convey steam from said steamchest to said cylinder. throttle means mounted on said steam chest tocontrol fluid pressure within said steam chest, said throttle meansbeing actuated by fluid pressure controlled from a remote point.

3. In combination with a steam locomotive cylinder, a steam chestmounted on said cylinder and adapted to enclose means to distributesteam to alternate ends of said cylinder, and ports adapted to conveysteam from said steam chest to said cylinder, throttle means mounted onsaid steam chest to control fluid pressure within said steam chest, saidthrottle means being actuated by fluid pressure within said steam chestoppos locomotive cylinder Lcasting comprisingfa. Ifcylinder, :a steamchest'ihereon, and 'alshousi'ng :limon and`communicatingfWith-zsaid:steam chest, saidv housing havingianinlet;aanoutletfcommunieatingV wthfzsad `steam chest, za. web betweenAsaid inletwandzsad outlet :provided rwith I a'valveeseat, `:avalveplemeni'. for f saidzseatcontrollingy ow'4 of -udaundev pressure.from saidinlettosadsteam -JOHN W."-:MARSH.

"REFERENCES 'CITED ''lhe following'v references are -of- 'reeoxdY-ini-'the Number

